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Silicon-based Mach-Zehnder modulator bias control device and system based on pilot frequency method

A technology of bias voltage control and modulator, applied in instruments, nonlinear optics, optics, etc., can solve problems affecting the accuracy of the overall control system, achieve the effects of simplifying generation, ensuring the accuracy of bias voltage control, and reducing distortion

Active Publication Date: 2021-06-08
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the existing bias control scheme based on the pilot method for the LiNbO3 Mach-Zehnder modulator is applied to the silicon-based Mach-Zehnder modulator, the phase shift caused by the pilot signal will produce additional nonlinear distortion, Thus affecting the accuracy of the overall control system

Method used

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  • Silicon-based Mach-Zehnder modulator bias control device and system based on pilot frequency method
  • Silicon-based Mach-Zehnder modulator bias control device and system based on pilot frequency method
  • Silicon-based Mach-Zehnder modulator bias control device and system based on pilot frequency method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A silicon-based Mach-Zehnder modulator bias control device based on the pilot method, such as Figure 4 As shown, including: monitoring module and bias control circuit;

[0051] The monitoring module, whose input end is connected to the output end of the silicon-based Mach-Zehnder modulator, is used to obtain part of the output optical signal of the silicon-based Mach-Zehnder modulator, and convert it into an electrical signal representing optical power information;

[0052] The bias voltage control circuit includes: a pilot signal generation module and a bias voltage adjustment module;

[0053] A pilot signal generating module, the output of which is connected to the first thermal regulator of the silicon-based Mach-Zehnder modulator, which is used to generate a pilot signal and apply it to the first thermal regulator;

[0054] The bias voltage adjustment module, its input end is connected to the output end of the monitoring module, and its output end is connected to ...

Embodiment 2

[0066] A silicon-based Mach-Zehnder modulator system such as Figure 4 and Figure 6 As shown, it includes: a silicon-based Mach-Zehnder modulator and the silicon-based Mach-Zehnder modulator bias control device based on the pilot method provided in the above-mentioned embodiment 1;

[0067] Optionally, in this embodiment, the phase modulator of the silicon-based Mach-Zehnder modulator is made of silicon-based materials; in some other embodiments of the present invention, the phase modulator of the silicon-based Mach-Zehnder modulator can also be made of LiNbO3 , InP and other materials capable of heterogeneous integration with silicon-based platforms;

[0068] Optionally, in this embodiment, the couplers used for light splitting and beam combining in the Mach-Zehnder modulator can be composed of Y-type couplers and 3dB couplers; in some other embodiments of the present invention, multi-mode interference can also be used Any photon module with light splitting and light combi...

Embodiment 3

[0072] An optical IQ modulator system based on a silicon-based Mach-Zehnder modulator, such as Figure 7 As shown, it includes: an optical IQ modulator based on a silicon-based Mach-Zehnder modulator and a bias voltage control device for a silicon-based Mach-Zehnder modulator based on a pilot method.

[0073] Such as Figure 7 As shown, the optical IQ modulator based on silicon-based Mach-Zehnder modulators consists of two silicon-based Mach-Zehnder modulators and an additional thermal regulator (ie Figure 7 The thermal regulator 1) and the coupler in the composition; one of the silicon-based Mach-Zehnder modulators includes two different thermal regulators, namely Figure 7 thermal regulator 2 and thermal regulator 3; another silicon-based Mach-Zehnder modulator also includes two different thermal regulators, namely Figure 7 Heat regulator 4 and heat regulator 5 in

[0074] Similar to Embodiment 1 above, in this embodiment, the bias voltage control device includes: a mon...

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Abstract

The invention discloses a silicon-based Mach-Zehnder modulator bias voltage control device and system based on a pilot frequency method, and belongs to the field of integrated photon system control. The silicon-based Mach-Zehnder modulator bias voltage control device comprises a monitoring module and a bias voltage control circuit. The input end of the monitoring module is connected with the output end of the silicon-based Mach-Zehnder modulator, and the monitoring module is used for acquiring part of output optical signals and converting the output optical signals into electric signals representing optical power information; the bias control circuit comprises a pilot signal generation module, the output end of which is connected with a first thermal regulator of the silicon-based Mach-Zehnder modulator, and the pilot signal generation module is used for generating a pilot signal and applying the pilot signal to the first thermal regulator; a bias voltage regulation module, the input end of the bias voltage regulation module being connected to the output end of the monitoring module, the output end of the bias voltage regulation module being connected with a second thermal regulator of the silicon-based Mach-Zehnder modulator, and the bias voltage regulation module being used for determining current bias point information according to the electric signal, generating corresponding bias voltage, applying the bias voltage to the second thermal regulator and compensating drift of the bias point. According to the invention, the bias control precision of the silicon-based Mach-Zehnder modulator can be improved.

Description

technical field [0001] The invention belongs to the field of integrated photonic system control, and more specifically relates to a silicon-based Mach-Zehnder modulator bias control device and system based on a pilot frequency method. Background technique [0002] As a high-performance electro-optic modulator with high bandwidth, low power consumption and low chirp, the traditional LiNbO3 Mach-Zehnder modulator has a wide range of applications in the research fields of optical communication, microwave photonics, and optoelectronic oscillators. However, due to environmental temperature fluctuations, uneven charge accumulation and distribution, etc., the bias point of the LiNbO3 Mach-Zehnder modulator often drifts to a certain extent, which deteriorates the transmission characteristics and affects the function of the overall modulation system. In order to solve this problem, a closed-loop feedback control scheme is often used to track the offset of the modulator's bias point i...

Claims

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Application Information

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IPC IPC(8): G02F1/01G02F1/21
CPCG02F1/0123G02F1/21
Inventor 谭旻汪宇航
Owner HUAZHONG UNIV OF SCI & TECH